Light angular distribution of fluorescent screens excited by x-rays

Giakoumakis, G. E.; Miliotis, D.

doi:10.1088/0031-9155/30/1/003

Cited by 44 publications

(22 citation statements)

References 7 publications

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“…Extending our measurements on screens of Cs1:Na prepared by evaporation, we observed that the light angular distribution for these screens was different from the Lambertian one, but also different from the distributions already known for the screens prepared by sedimentation (Giakoumakis and Miliotis 1985). After this observation we extended our study to single-crystal fluorescent screens and to plastic-foil phosphor screens.…”

Section: Introductionmentioning

confidence: 53%

“…In a previous paper (Giakoumakis and Miliotis 1985) we have reported our measurements on the light angular distribution of fluorescent screens excited by x-rays. It was found that this angular distribution is substantially different from the Lambertian.…”

Section: Introductionmentioning

confidence: 99%

“…From now on for the sake of simplicity we will name the screens mentioned above 'compact' and the screens prepared by sedimentation 'granular'. We give no examples of the errors appearing in the various fluorescent screen calculations, which are due to using the Lambertian distribution instead of the real one, but these errors are of the same nature and order as in the case of the granular phosphor screens (Giakoumakis and Miliotis 1985). Because of this, the knowledge of the actual angular distribution of the light emitted from compact screens is important, for instance, in the cases of absolute-efficiency measurements, etc.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Problems of the development of catalytic after-burners for the exhaust gases from automobiles and of alternative ecologically clean fuels

Крылов¹,

Minachev²,

Панчишный³

1991

Russ. Chem. Rev.

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The angular distribution of the light emitted from non-granular phosphor screens is studied. This angular distribution is found to be different both from the Lambertian one and from the distribution known for granular phosphor screens. Experimental results are discussed on the basis of a plausible physical model, which takes into account the absorption and scattering of the light in the screen as well as the refraction of the light at the screen's surface.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Problems of the development of catalytic after-burners for the exhaust gases from automobiles and of alternative ecologically clean fuels

Крылов¹,

Minachev²,

Панчишный³

1991

Russ. Chem. Rev.

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“…Both numerical simulations and experimental studies of light scattering inside fluorescent screen are found in many places [50,26,46,4]. The result depends on the density and the shape of the scatterers in the screen, and the angular distributions of scattered light in literature are not very far from that of Lambertian objects.…”

Section: Scattering Model Of Screensmentioning

confidence: 99%

Task-based lens design with application to digital mammography

Chen

Barrett

2005

J. Opt. Soc. Am. A

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“…While their properties were well studied for x-rays [172][173][174][175] because of the high demand from the medical field and their long history, to the author's knowledge, there was only one publication as of 2007 on the relativistic e-beam detection with such a scintillating screen [164].…”

Section: Introductionmentioning

confidence: 99%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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Light angular distribution of fluorescent screens excited by x-rays

Cited by 44 publications

References 7 publications

Problems of the development of catalytic after-burners for the exhaust gases from automobiles and of alternative ecologically clean fuels

Problems of the development of catalytic after-burners for the exhaust gases from automobiles and of alternative ecologically clean fuels

Task-based lens design with application to digital mammography

Control of Laser Plasma Based Accelerators up to 1 GeV

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